“Avast recommends leaving systems at the login screen for about 15 minutes and then rebooting; the antivirus software should then update itself automatically in the background.”
Update for Sophos, Avira, and ArcaBit users, have been blocked by Microsoft. McAfee is investigating the issue, while ArcaBit and Avast already released updates that address the problem.
According to experts at Avast and McAfee, the root cause of the problem is the change that Microsoft made to CSRSS (“client/server runtime subsystem”) component that manages Win32 applications. The experts believe that antivirus solutions are blocked while attempting to access some resource.
At the time it was difficult to understand what has happened and if the problem could definitively be solved by applying antivirus updates of fixes of the operating system.
Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer.
Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US.
Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines.
Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.